Sheet-metal lock-joint



(No Model.)

L.- L. SAGENDORPH.

SHEET METAL LOCK JOINT.

No. 468,484. Patented Feb. 9, 1892.

UNITED STATES LON GLEY LEYVIS SAGENDORPII, OF PHILADELPHIA, PENNSYLVANIAASSIGNOR OF ONE-HALF TO CHARLES N. HARDER, OF PIIILMONT NEW YORK.

PATENT OFFICE.

SHEET-METAL LOCK-JOINT.

SPECIFICATION forming part of Letters Patent No. 468,484, dated February9, 1892.

Application filed July 25, 1891. Serial No. 400,736. (No model.)

To all whom it may concern:

Be it known that I, LONGLEY LEWIS SAGEN- DORPH, a citizen of the UnitedStates, residing at Philadelphia, in the county of Philadelphia, Stateof Pennsylvania, have invented certain new and useful Improvements inSheet-Metal Lock-Joints, of which the following is a specification,reference being had to the accompanying drawings.

My improved lock-joint for metal sheets is designed more especially foruse in connection with roofing-sheets, and is an improvement over thejoint patented to me on April 8, 1890, Patent No. 425,002.

In the accompanying drawings, Figure 1 is a perspective view of twosheets of metal united by means of the ordinary hooked flanges, which isthe first step toward forming my improved lock-joint. Fig. 2 is a viewsimilar to Fig. 1 with the addition of my invention. Fig. 3 is aperspective view of two roofing-sheets united by means of my improvedlock-joint with the side flanges bent to position. Fig. 4is atransversesection taken through the lock-joint shown in Figs. 2 and 3, saidsection being on an enlarged scale.

My invention consists in forming in the seam of two sheets (said seambeing formed by the interlocking flanges, as shown in Fig. 1) twolongitudinal corrugations A B, preferably circular in cross-section,said corrugations extending along the outer edges of said seam, one ofsaid corrugations being concave and the other convex on the same plane.Between the outer circular corrugations A B is formed one or moreV-shaped corrugations 0, extending parallel with the outer corrugations.The body of each sheet is gradually rounded upward and downward,respectively, at each side the seam, and when the sheets are joined bymy improved lock-joint or seam said sheets at each side the seam will beon the same plane.

\Vhen my improved lock-joint is used in connection with roofing-sheets,as shown, the corrugations preferably do not extend the full length'ofthe seam, but terminate a short distance from the outer edges in orderto permit of the side flanges Z2 being readily bent to position whenplaced on the roof.

The advantages arising from the use of my improved lock-joint hereinshown and set forth are first, the joint thus formed is watertight, theV-shaped corrugations O in connection with the outer corrugationstending to effectuallycheck any capillary attraction; second, the jointthus formed will permit of air spaces beneath the seam, thus tending toprolong the life of the latter and also prevent decay of the sheeting atthat point; third, saving of solder; fourth, by reason of the outercorrugations A B being rounded in opposite directions in cross-sectioneither side of the sheets may be laid outward, and, fifth, any desirednumber of sheets may be joined by means of my improved lock-joint andthen rolled in a compact form for shipment without danger of any of saidsheets becoming disengaged.

What I claim as new, and desire to secure by Letters Patent, is-

1. A sheet-metal lock-joint consisting of longitudinal corrugationsformed in the outer edges of the interlocking flanges of said sheetswith a central V-shaped corrugation between and parallel with said outercorrugations, for the purposes specified.

'2. In a sheet-metal lock-joint formed by the ordinary interlockingflanges, the outer corrugations A 13, formed in said interlocked seam,with the central V-shaped corrugations O, the corrugations A B beingformed in opposite directions to one face, substantially as set forth.

LOSGLEY LEWIS SAGENDORPH. lVitnesses:

A. L. FoULDs, WM. AUBREY.

